β-Octamolybdate as a Building Block. Synthesis and Structural Characterization of Rare Earth−Molybdate Adducts

Abstract

Reaction of [(n-C4H9)4N]4[Mo8O26] with nitrate salts of rare earth metals yields two different series of new compounds [Ln(Mo8O26)2]5- and [{Ln(NO3)3}2(Mo8O26)]4- (Ln = Y, La, Ce, Pr, Nd, Gd, Yb) as tetra-n-butylammonium salts. X-ray structural analyses of [(n-C4H9)4N]5[La(Mo8O26)2]·CH3CN [monoclinic, space group P21/c, a = 25.8332(6) Å, b = 17.5054(7) Å, c = 32.6565(12) Å, β = 91.699(2)°, Z = 4] and [(n-C4H9)4N]4[{La(NO3)3}2(Mo8O26)]·2CH3CN [monoclinic, space group P21/n, a = 17.702(2) Å, b = 17.2646(12) Å, c = 18.965(2) Å, β = 102.132(3)°, Z = 2] revealed that these compounds contain the Mo8O26 unit as their building block.